* CriticalResearchFailure: "The Metamorph" explains how an Eagle is desperately searching for the "rare metal" that is... titanium.
* CrowningMomentOfHeartwarming: John and Victor's warm conversation as the moon approaches the Black Sun [[spoiler: and their conversation with the "cosmic intelligence" as they go through]].
* CrowningMusicOfAwesome: Barry Gray's scores for Season One.
** And the unworldly-sounding sitar score for "The Troubled Spirit".
* EnsembleDarkhorse: Alan Carter was originally planned to be written out as part of the cast changes for Season Two. However, when the producers learned how popular he was with viewers, he was kept on and given an expanded role.
** To a degree, Fraser in Series 2.
* FridgeHorror: With every death of any of the irreplaceable 311 people on Moonbase Alpha, even RedShirt characters, and to a lesser extent the loss of equipment, the bleaker the isolated crew's chances of survival become through the series even as they helplessly drift out of control through space.
** Gets even worse when you think of episodes like "The Exiles", where a key plot element involves the fact that the Alpha life support system cannot support the 300 or so people on the base by that time. As a result, they are not only unable to [[spoiler: take in the Galosian exile criminals]], but they are also unable to ''permit any more births on the base''.
* IdiotPlot: the second season, especially - so much so that even Martin Landau complained (in particular, he hated "All That Glisters"[[note]]as did the rest of the cast[[/note]] so much that he threatened to quit).
* OurVampiresAreDifferent: Anton Zoref is transformed into a heat-craving one in "Force of Life".
* SpecialEffectsFailure: Allegedly thanks to the low budget; inevitably, it was nicknamed ''Space: 19.99''
** At the time, it was the most expensive TV series ever made and the effects still stand up today, so this is probably an indication that critics didn't check their facts.
*** The spaceship fx are extremely high quality, and usually achieved using double-exposure rather than blue screen. This means the images are captured on the original negative and don't suffer from extra grain, although this does limit the angles that can be used. On the other hand the show does have some extremely poor matte paintings.
** As has been said, the overall production value was very high, approaching feature film quality in many areas. The fly in the ointment is the writing; many cast members have made the point that the producers seemed more interested in the special effects than the scripts. That said, some of the actors rose above the material and there are some excellent character scenes, mainly those involving Barry Morse as Professor Victor Bergman.
** There is a certain dissonance between good and bad special effects. Obviously, some viewers remember the good ones and other the bad ones. As an example, in the first-season episode "Dragon's Domain", we see a number of abandonded spaceships -- created as very detailed and realistic-looking models -- orbiting a supposedly Earth-like planet that looks more like a brightly-coloured plasticine ball (perhaps from a third-grader's art project) than any real planet.
** The eponymous "Dragon" of the episode mentioned above is a very static TentacleMonster that appears stuck in a doorway. In some shots it does look rather nightmarish, but the fight between it and the protagonist looks very much like a stage fight, with an actor trying to look like he's fighting obviously platic tentacles.
** Just a couple of years later, the StarWars movies came along and changed everything. Compared to StarWars and later productions, {{Space 1999}} does indeed look a bit on the cheap side.
* WhatTheHellCostumingDepartment: Despite the uniforms being designed by famous fashion designer Rudy Gernreich, they didn't look very cool or interesting even back then. If the intention was to avert the SpaceClothes trope they succeeded only too well.
* The whole series might actually make more sense if viewed as [[RecycledINSPACE Fantasy IN SPACE]] rather than ScienceFiction.
** All of the scientific... ahem... ''inaccuracies'' would go away. AWizardDidIt!
** Many of the plots are about inner journeys, mind control, possession - all classic Fantasy topics. As is fighting against the MonsterOfTheWeek.
** And Professor Bergman would fit better as a wise old wizard than as a scientist - he's almost never shown doing any actual science, or rational reasoning, but rather seems to have some mystical knowledge of what's going on.